[boost] Minor problem with random::lognormal_distribution

[Michael Stevens]

There is a small correction required for lognormal_distribution.
The problem is flagged under GCC3.2

 explicit lognormal_distribution(base_type & rng,
                                 result_type mean = result_type(1),
                                 result_type sigma = result_type(1))
...
 RealType& mean() const { return _mean; }
 RealType& sigma() const { return _sigma; }

should probably read.

 RealType mean() const { return _mean; }
 RealType sigma() const { return _sigma; }

Michael





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